java - JFrame页面授权登录后如何进入下一个JPanel页面？

Question

我想开发一个 Swing 桌面应用程序，但如果我单击登录按钮，它不会进入下一页。有人帮帮我吗？

ActionListener 代码如下:

private void loginAddActionListener(java.awt.event.ActionEvent evt) {                         

    int count = 0;
    try {
        String sql = "SELECT * FROM tbl_name WHERE username=? AND password=?";
        c = ConnectionKimyaLab.getConnection();
        ps = c.prepareStatement(sql);
        ps.setString(1, username.getText());
        ps.setString(2, password.getText());
        rs = ps.executeQuery();

        while (rs.next()) {
            count = count + 1;
        }

        if (count == 1) {
            JOptionPane.showMessageDialog(null, "Correct", "Main Page Title", JOptionPane.INFORMATION_MESSAGE);
            Next_JPanel = new Next_JPanel ();
            k.setVisible(true);
        } else {
            JOptionPane.showMessageDialog(null, "Incorrect", "Main Page Title", JOptionPane.WARNING_MESSAGE);
        }
    } catch (HeadlessException | SQLException e) {
        JOptionPane.showMessageDialog(null, e);
    } finally {
        try {
            rs.close();
            ps.close();
            //conn.close();
        } catch (Exception e) {
        }
    }
}

Answer 1

您应该查看 Java 提供的 CardLayout 示例:

https://docs.oracle.com/javase/tutorial/uiswing/layout/card.html

它可以帮助您在同一个容器中同时准备好多个用户界面，但在任何时候仅使一个可见。